Novel carbamates of 5- and 6-membered hetero-sulfur compounds and process for preparing same



United States Patent "cc 9356! Patented July 6, 1965 and 3,193,561 NOVEL CARBAMATES 0F AND 6-MEMBERED [Ia] R2 R1\ IETERO-SULFUR COMPOUNDS AND PROQESS R3 S R1 0 FORPREPARINGSAME 5 /n 35 Roger Williams Addor, Pennington, N.J., assignor to C C=NOM N X American Cyanamid Company, Stamford, Comm, a

corporation of Maine No Drawing. Filed Sept. 20, 1962, Ser. No. 225,135 a Ru 8 Claims. (Cl. 260-327) K The present application is a continuation-in-part of a E I cope'nding application for Letters Patent, Serial No. C=NO N 112,531, filed on May 25, 1961, now abandoned, which in turn is a continuation-in-part of a copending application a for Letters Patent, Serial No. 40,539, filed on July 5,

1960, now abandoned.

The present invention relates to carbamates of heterowh rein R R R R R R and n represent the same cyclic sulfur moieties containing from five to six atoms valu a bove; R and R represent hydrogen or lower and has as its principal object the utilization of such caralkyl and may be the same or dilterent; M is an alkali barnates as the active component of an insecticidal comt l, u h a sodium, potassium or lithium; and X is a positionhalogen atom, such as fluoro, chloro, bromo or iodo.

The nove he emr omp n s p pared in 3.0- Alternatively, the carbamates of the present invention cordance with the present invention may be repres nt d can be prepared by the reaction between 2-oximino heteroby the general formula: cyclic sulfur compounds or the corresponding alkali metal salts thereof and phosgene, followed by further reaction with either ammonia, a primary amine or a secondary amine in accordance with the following over-all reactions: Ra To s\ 0 R 0 O=NO iN [A] R, /R1\ R4/ \C Q/ Ra Ra \C S\ O Rs 0 o=N0M+ou m1 B4 /c\ Q wherein R R R R R and R are hydrogen, lower 35 R5 R0 alkyl or phenyl radicals, which may be the same or dif- R, R1 ferent, n is an integer from O to 1, Q represents either a Rs S 0 sulfur or oxygen atom, and R and R are hydrogen or /n a lower alkyl radicals. /C=No C1 M01 In general, the compounds of the present invention 40 B4 0 Q may be prepared by a number of diverse processes. Illustrative of one such process involves the reaction between (1) either a 2-oximino derivative of the heterocyclic sulfur moiety or the corresponding alkali metal salt thereand of and (2) either an isocyanate or a carbamyl halide. Each reactant is advantageously present in equimolar [B1 \l amounts at temperatures ranging from about 0 C. to R 0 s 0 R about 1000 0 C-NO C C1+2 NH The over-all reaction may be represented as: Q/

l 8 Rs Re [I] R: R1

rt ls s an (Ra /R1\ wherein R R R R R R R R Q and n all rep- C S 0 resent the same values as above.

a /n l It is an advantage of the present invention that a large number of alkyl isocyanates and carbamyl halides may R4 0 Q E be employed in herein-above defined Reactions [1] or [Ia]. Such illustrative but non-limitative reactants include, for instance, methyl isocyan'ate, ethyl isocyanate, propyl isocyanate, t-butyl isocyanate, n-pentyl isocyanate, n-hexyl isocyanate and heptyl isocyanate as well as carbamyl chloride, N-rnethyl carbamyl chloride, N,N-dimethyl carbamyl chloride, N,N-diethyl carbamyl bromide, N,N-dipropyl carbamyl chloride and N,N-dibutyl;carbamyl iodide.

In the above reaction designated as [B], ammonia and a variety of alkyl amines can-advantageously be employed. Exemplary amines are; methylamine, ethylamine, propylamine, butylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine, diamylamine, dihexylamine, homologs and isomers thereof.

The heterocyclic reactants possessing the desired 2- oximino substituent' can be prepared from a variety of heterocyclic compounds which include:

2-imino-1,3dithiolane Z-iminol ,3 -oxathiolane 2-imino-1,3-dithiane 2-imino-l ,3-oxathiane Z-methylimino-1,3-dithiolane 2-ethylimino-1,3-oxathiolane 2-n-propylimino-1,3-dithiane Z-n-butylimino- 1 ,3-oxathiane as well as the ring-substituted lower alkyl or ring-subsn tuted phenyl derivatives thereof.

In general, the 2-imino heterocyclic sulfur reactant dihalide, such as ethylene bromide, ethylene chloride, 1,2- dibromopropane, 1,3-diiodopropane and 1,3.-di-chloropropane. ResultantZ-i'mino heterocyclic sulfur hydrohalide or 2-alkylimino-heterocyclic sulfur hydrohalide can be reacted next with a hydroxylamine salt, such as either hydroxylamine hydrohalide or hydroxylarnine sulfate, to

obtain 2-oxirnino-hetero-sulfur derivatives which are utilized as reactants herein.

In order to facilitate a further understanding of the present invention, the following illustrative examples are presented. These are not to be taken as limitative of the invention. Unless otherwise stated, the parts are by weight.

EXAMPLE 1' Prepartiom of 2-imino-1,3-dithiolane hydrochloride In the foregoing, similar results are'obtained where cyanogen bromide is substituted for cyanogen chloride.

EXAMPLE 2 a V Preparation of 'Z-imino-I,3-0xathiolanehydrochloride ammonium alkyldithiocarbamate salt and an alkylene 4 A mixture of 50 parts of merca ptoethanol in 200 parts of benzene in a flask equipped with a stirrer, ice-Watercooled condenser, gas inlet tube and thermometer is heated to 50 C. and 44 parts of a gaseous cyanogen chloride are passed in'over a two and one-half hour period. The temperature rises spontaneously, to C. C. when about half of the cyanogen chloride is added, solids begin forming, and the temperature stays at this level during the remainder of the addition period. After the mixture has been maintained at 40 C.45 C. for an additional four and one-half hours and stayed overnight at room temperature, the solid 2-imino-1;3-oxathiolane hydrochloride amounting to 47 parts, or 52'percent of theory, is collected.

7 EXAMPLE 3 2-imin0 5-m-ethyl-1,3-0xathi0lane hydrochloride Example'l above is repeated in every detail, except that r1-hydroxy-2-mercapto-n propane is substituted for the ethanedithiol reactant therein. Resultant product, 2- imino-S-methyl-1,3-0xathiolane, is obtained in good yield and purity.

EXAMPLE 4 Preparation of 2 is0'pr0pylimz'no-1,S-dithiolane To a stirred mixture of 10.0 parts of ethylene bromide and 8.8'parts of potassium carbonate in parts of absolute ethanol at 38 C.40 C.- are added 10.4 parts of isopropylamino ammonium isopropyldithiocarbamate in small increments over .a one-hour period. After heating .to reflux for ten minutes, the mixture is cooled, resultant solids are filtered off, and the alcohol solution diluted with about three volumes of water. Extraction of the having a boiling point of 81'C.-83 C./0.30 mm. Hg and a refractive index (n of 1.5671.

Analysis for C H NS CalculatedC, 44.68; H, 6.88; S, 39.76. Found-C, 44.82; H, 7.09; S, 39.85.

EXAMPLE 5 Preparation of 4-methyl-2-methylimino-I,3-dithi0lane To a stirred mixture of 99.7 parts of 1,2-dibromopropane in 300 parts of ethanol at 40 C. are added 65.9 parts of methylamino ammonium methyldithiocarbamate overa period of one hour. After heating for an additional hour at 50 C., the mixture is cooled, 300 parts of ether and one equivalent of sodium hydroxide are added, and

the organic phase is separated. The organic phase is dried. with magnesium sulfate and the solvent stripped. Distillationof the residue yields 15.9 parts of desired product and 22.8 partsof unreacted dibromopropane.

;A sample of the product'on redistillation boils at 54 C./0.04 mm., and has a refractive index (11 of 1.5781. Analysis for C H NS Calculated-C, 40.78; H, 6.16; S, 43.55. Found--C, 40.94; H, 6.17; S, 43.52.

7 EXAMPLE 6 Preparation of 2-imino-1 ,3-dithian'e hydrochloride is sublimed at 'C.-100 C./0.05 mm. Hg for analysis.

It melts with darkening at C. C.

1 Analysis for C H ClNS Calculated-43, 28.31; H, 4.75; C], 20.89. Found-C, 27.99; H, 5.18; C1, 20.89.

' EXAMPLE 7 Preparation of 2-0ximino-1,3-dithi0lane A mixture of 0.21 part of 2-isopropylimino-1,3-dithio- EXAMPLE 8 Preparation of 2-0ximin0-1,3-oxathi0lane A mixture consisting of 55.0 parts of 2-imino-1,3- dithiolane hydrochloride obtained in Example 1 above, 27.1 parts ofhydroxylamine hydrochloride and 34.8 parts of sodium acetate is mixed at 70 C.-75 C. for one hour. Crystallization of the resultant oxime occurred. After cooling to room temperature and filtering, a 87.6 percent yield of colorless 2-oximino-1,3-dithio1ane is obtained, melting at 126 C.-128 C.

EXAMPLE 9 Preparation 2-oximin0-1,3-0xathi0lane To a stirred mixture of 19.0 parts of 2-imino-1,3- oxathiolane hydrochloride and 10.4 parts of hydroxylamine hydrochloride in 75 parts of waterare added 12.3 parts of solid sodium acetate in increments over a twohour period. After twenty-four hours, 12.5 parts of solid sodium bicarbonate are added slowly. 'The mixture is filtered, the filtrate is diluted with an equal volume of a saturated salt solution, and the mixture is continuosly ether extracted for fourteen hours. The semi-solid residue obtained by evaporation of the ether is extracted several times with hot benzene. The benzene on dilution with hexane gives several fractions of solids which are combined. Recrystallization from benzene plus a small quantity of hexane afiords 5.2 parts, or 32 percent of theory of 2-oximino-1,3-oxathiolane having a melting point of 111 C.-116 C. Sample recrystallized further melts at 116.4 C.117.2 C.

Analysis for C H NO S: Calculated-C, 30.24; H, 4.23; N, 11.76; S, 26.91. Found C, 30.29; H, 4.24; N, 11.76; S, 26.96.

EXAMPLE Preparation of 4-methyl-2-0ximin0-1,S-dithiolane A solution of 10.0 parts of 4 -methyl-2-methylimino- 1,3-dithiolane and 5.2 parts of hydroxylamine hydrochloride in 80 parts of 40% ethanol is heated on a steam bath for four hours. The yellow oily product obtained after extracting the reaction mixture with ether, treating the ether solution with activated carbon and magnesium sulfate, and stripping off the ether, amounts to 9.1 parts or 90 percent of theory. The infrared spectrum shows the expected C=N- band absorption at 1600 cm EXAMPLE 11 Preparation of 2-0Iximin0-1 ,3-dithiane A mixture of 18.0 parts of 2-imino-1,3,dithiane hydrochloride, 8.1 parts of hydroxylamine hydrochloride, and 9.6 parts of sodium acetate in 200 parts of water is slowly heated to 64 C. over a one-hour period and then 'to 75 C.- over the next fifteen minutes. After cooling the mixture, extraction with ether in the usual manner affords 11.6 parts of product as an oil which soon crystallizes. Recrystallization from the benzene-hexane mixture gives 8.9 parts of the oxime, melting point 92.4 C.-94.8 C. A small sample recrystallized once again for analysis melts at 94.0 C.95.0 C.

Analysis for C H NOS Calculated-C, 32.19; H, 4.73; N, 9.39; S, 42.97. Found-C, 32.11; H, 4.86; N, 9.30; S, 42.98.

6 EXAMPLE 12 Preparation of 2-0ximin0-5-methyl-1 ,3bxathiolane To an agitated mixture of 100.0 parts of 2-imino-5- methyl-1,3-oxathiolanehydrochloride and 45.3 parts of hydroxylamine hydrochloride in 200 parts of dry methan0l are added in increments at room temperature over a gne hour period 53.4 parts of sodium acetate. After stirring the mixture at room temperature overnight, it is heated at 50 C. for two hours and then cooled. There are then added 66 parts of potassium bicarbonate and 200 parts of ether followed by stirring for two hours, and the reaction mixture is then filtered. The filtrate is concentrated. Extraction of the residue successively with benzene and ether, followed by concentration of the etherbenzene mixture, yields 56.9 parts of crude product. The oil remaining from the benzene-ether extraction is mixed with methanol and 200 parts of chloroform and the mixture is washed successively with partially saturated salt solution and with a saturated salt solution. After filtering through magnesium sulfate, concentration of the chloroform mixture leaves another 23.0 parts of crude oxime. Recrystallization of the combined crude oxime from a 1:1 benzene-ether mixture gives 40.0 parts, or 46.2 percent of theory of product, having a melting point equal to 92 C.-94 C. A sample, vacuum sublimed for analysis, melts at 940 C.95.2 C.

Analysis for C H NO S: Calculated-C, 36.07; H, 5.30; N, 10.52; S, 24.08. Found-C, 36.27; H, 5.45; N, 10.56; S, 24.21.

EXAMPLE 13 Preparation of 4,5 -dimethyl-2-0ximino-1 ,3-dithi0lane Preparation of 4-n-butyl-2-0ximin0-1,3-dithiolane A mixture of 13.0 parts of 4-n-butyl-2-imino-1,3-dithi olane hydrochloride, 4.7 parts of hydroxylamine hydrochloride, and 5.8 parts of sodium acetate is stirred and heated at 70 C. C. for two hours. On cooling, a VlSCOUS oil separates. The Water is decanted away from the oil and the oil taken up with ether and dried by filtration through magnesium sulfate. Evaporation of the ether gives 10.7 parts or 91.8% of theory, of the oxime. The infrared absorption curve of the oxime shows bands at 950 cm.- and 1580 cm.- attributable to the and =C=N bonds, respectively, and several bands in the 2800 cm: and 3300 cmr region assignable to the -OH function.

EXAMPLE 15 Preparation of 4-prienyI-Z- ximinO-I J-dizfhiolane The procedure of Example 14 is repeated in every detail, except that 2.8 parts of 4-phenyl-2- irnino-1,3-dithiolane hydrochloride are employed in lieu of the 4-nbutyl dithiolane reactant to provide 2.3 parts, or 91.7 percent of theory, of 4-phenyl-2-oximino-1,3-dithiolane as a viscous oil. The infrared absorption curve of this product, in addition to showing numerousbands assignable to the phenyl ring, shows a =C=N band at 1575 cm. and

cm.- .2920 cm.".. and 3200 (bro ad).cm.

EXAMPLE'16 Preparation of N-mthyl 'carb a mate of I Z-Oximino-I ,3-dithilane To 5.3 parts of 2-oxiniino-l,3-dithiolane dissolved partially'in 20 parts of dry etherin'a suitableice-cooled reac:

tion flaskare added 2.5 parts (by volume) of methyl isocyanate and 0.1 part of tr-ietliylamine. The flask is then removed from the ice-bath and themixture is stirredat These solids together ,withthose obtained after removal of inorganic salts from the original filter cake with water, amount to 9.1 parts, or 80 percent of theory, of the carbamate of 2-oximino-1,3-dithiolane having a melting point equal to'130. -C.-132 C. After recrystallization from a chloroform-hexane mixture, the product melts'at 133 C.-135 C. and analyzes in percent as follows for room temperaturefor twelve hours. A'yield of 97 percent of desired carbamate is obtained as a solid melting at 81 C.83 C.1 Recrystallizationfrom the benzenehexane mixture yields N-methyl c'arbamate of 2-oximino-- a 0.90 part (by volume) of methyl isocyanate, and a trace '1,3-dithiolane melting at 82.2 C.-83.4 C. Calculated for C H N O S the carbon,'hydrogen and sulfur contents are, respectively, 312; 4.2 and 33.4, all in percent. It is found that the carbon,'hydrogen and sulfur analysis, respectively, is: 31 .4; 4.4 and 33.3, all in percent.

Substituting n-hexyl isocyanate (6.08 parts) for t'rr' methyl isocyanate above, N-hexyl carbamate of 2-oxim1- no-1,3-dithiolane is' obtained in 93% yield.

' EXAMPLE 17 Preparation of N-ethyl-carbamate of Z-oximino-l ,3-ditiu'olane To a suitable ice-cooled reaction vessel are added 5.0'

parts of 2-oximino-1,3-dithiolane in parts .(by .vol-

ume) of dry ether and 2.6 parts (by volume) of ethyliso- The contents of cyanate. and 70.1 part of triethylamine. the flask are then stirred'for twenty-four hoursat room temperature. After stripping off the ether, theethyl carbamate product is collected as an oil which crystallizes on seeding. Recrystallizationfrom benzene-petroleum ether' yields 55'v percent of the N-ethyl carbamate product having a melting point of 51.0 C.-52.5 C. and analyzesin per cent as follows for C H N O' S V CalculatedC, 34.9; H, 4.9; S, 31.1. ;Found-C,'35.1; H, 4.8; S, 31.2.. I

' EXAMPLE 18 Preparation of N,N- dimethyl-carbqmate of 'Z-OvtiminoR To a suitable reaction vessel are added 7.0 parts of the sodium salt of 2-oximino-1,3-dithiolane in 50 parts (by volume) of dry acetone and 4.7 parts of dimethyl car- 7 After refluxing the mixture for three bamyl chloride. hours, an equal volume of water is added and the dimethyl carbamate product is extracted with a 50-50 etherabenzene mixture. Recrystallization from a methanol-water mixture yields 5 8 percent'of the desired product having a melting pointof 94.2 C.95.0 C. and analyzes in per-,

EXAMPLE 19 Preparation of the carbamate of Z-oximino-I,3-dithi0lane Into an ice-cooled reaction Vessel equipped with an icecooled condenser and containing 75 parts (by volume) of dry ether are added 18.9 parts of phosgenen To this mix- .A second recrystallization 7 Preparation of EXAMPLE" 20 Preparation of the. N-m ethyl carbamate of Z-Oximzno- JQS-oxathiolane mixture of 1.67 parts of 2- oximinol,3-oxathiolane,

of triethylaminein 10parts of dry ether is allowed to stand for two days. crystallization of the residue from an'isopropanol hexane mixture gives 1.43 parts, or 57.8 percent of theory, of the carbamate, having a melting point of 882 C.,90.2 C. renders a'product melting at 89.6 C.-90.8 C.

Analysis for C H N O S: Calculated-C, 34.07; H, 4.58; N, 15.90; 'S, 18.20. Found-C, 34.40;H, 4.94; N, 16.05;S, 18.37.

" EXAMPLE 21 the N-m-eth'yl' carbamate 0 4-m'ethyl-2- oximino-1 ,d-dithiolan'e p r A- mixture of 9.1 parts of 4-metl1yl-2-oximino-1,3-dithiolane, 3.7 parts (by volume) of methyl isocyanate and 0. 3'part oftriethylamine in 75 parts of dry ether is stirred and allowed to stand overnight. Evaporation of the ether renders --a crude oil product. The major portion of crude 7 material isjpurified'by molecularv distillationto give 8.6

parts, or 68 percent of theory, of the pure product.

Analysis. for C H N O S CalculatedC, 34.93; H, 4.89; N, 13.58; S,'3 1.09.'- Found-C, 34.91; H, 5.18; N,

' EXAMPLE 22.

' dithiane and 0.2 part'of triethylamine in 25 parts of dry ether are added 2 5 parts (by volume) of methylisocyanate. After coming to room temperature, the mixture is refluxed for two hours. Sufficient chloroform is added to 7 dissolve the oil which formedand the mixture'is washed "with dilute sodium hydroxide solution and water and I dried. Stripping off the solvent leaves 6.0 parts or 72 per.

ture is next introduced in increments a total of 10.0 parts i of the sodium .salt of 2oximino-1,3-dithiolane over a thirty-minute period." After stirring the mixture at room temperature for about fifteen hours, excess phosgene is removed by distillation. ,The remaining mixture is ice- .cooled. The latter is then added to a solution of 2.2 parts .of ammonia in 100 parts (by volume) of dry ,acetonitrile.

After removing the ice bath to allow the mixture to cometo room temperature, the mixture is filtered and the fil- I ,trate stripped of solvent. The solid residue is extracted cent of theory of product asanoil which is induced to crystallize and melts at 89 C.-92 C. Recrystallization from a benzene-hexane mixture yields short, colorless needles having a melting point of 92.8? C.93.8 C.

Analysis for -C H N O S Calculated-C, 34.93; H, 4.86; S, 31.09. Pound-.C,.35. 29; H, 5.26; S, 31.08.

M EXAMPLE 23 Preparation of the N-methylcarbamate 0] 7 4,5 -dimethyl-2-0ximinU-1 ,3-dithi0lane To a stirred ice-cooled mixture of 9.0;parts of 4,5-dimethyl-Z-oximino-1,3-dithiolane and 0.1 part. oftriethylamine-in 25 parts of' dry ether are pipetted 3.8 parts by volume of methylisocyanate. The ice bath is removed after 30 minutes and the mixture allowed to stand over- ,night. The mixture is recooled by means of an ice-bath.

in a Soxhlet apparatus with petroleum ether to remove inr- V purities, such as unreacted'chlorocarbonate intermediate.; Found-PC, 38.25; H, 5.64; N, 12.78; 8,, 29.18.

Thus-formed solids are collected and recrystallized from benzene-hexane to yield 10.1 parts or 82.1 percent of theory of the carbamate having a melting point of 74 'C.-77 C. and'analyzingas follows for C H N O S Calculated-Q3817; H, 5.49;. N, 12.72; S, 29.11.

Evaporation .of the ether' and re 9 EXAMPLE 24 Preparation of the N-methyl carbamte f -methyl-2-oximin0-1 ,3 -0xathi0lane EXAMPLE 25 Preparation of the N-methyl carbamate 0 I 4-n-butyl-2-0ximin0-1,3-dithiolane The procedure described in Example 16 is followed employing 4-n-butyl-2-oximino-1,3-dithiolane instead of 2-oximino-1,3-dithiolane. The N-methylcarbamate of 4- n-butyl-Z-oximino-l,3-dithiolane is obtained in 73 percent yield as a solid melting at 75 C.78 C. after recrystallization from ether-petroleum ether. On analysis, the following data is further obtained:

Calculated fOI' C H N O S -C, H, 6. 11; N, 11.33; S, 25.92. Found: C, 43.69; H, 6.06; N, 11.42; S, 26.10.

EXAMPLE 26 Preparation of the N-methyl carhamate of 4-phenyl-2-0ximin0-1,3-diflziolane The procedure of Example 16 is followed employing 4-phenyl-2-oximino-1,3-dithiolane. instead of 2-oximino-1, 3-dithiolane. The N-methyl carbamate of 4-phenyl-2- oximinio-1,3-dithiolane is recovered in 64 percent yield as a solid melting at 131 C.-133 C. after recrystallization from methanol-water. The carbamate analyzes as follows:

Calculated for C H N O S C, 49.22; H, 4.51; N, 10.44; S, 23.89. Found-C, 49.01; H, 5.03; N, 10.30; S, 23.68.

EXAMPLE 27 Preparation of the N-methyl carbamate 0 4,4-dimethyl-Z-oximin01,3-dithi0lane The procedure of Example 16 is repeated in every detail, except that 4,4-dimcthyl-2-oximino-1,3-dithi0lane is employed instead of 2-oximino-1,3-dithiolane. The

crude solid carbamate is employed directly for insecticidal testing. It is characterized by its infrared absorbtion spectrum which shows an NH band at 3300 cm.- a C=O band at 1720 cmr a C:N band at 1540 cm.- and an NO band at 940 cm.-

To illustrate the insecticidal activity of the carbamates of 2-oxirnino1,3-dithiolanes, 1,3-oxathiolanes, 1,3-dithianes and 1,3-oxathianes of the present invention, the following example is presented:

EXAMPLE 28 Representative compounds illustrated by structure in the table below are diluted with a mixture of 65-35 acetone-water, respectively, to produce the several tabulated concentrations. Pots containing two or three nasturtium plants two inches tall are infested with nasturtium aphids two days before they are selected for testing. The pots are placed on a turntable and the plants are sprayed with a test compound. It is observed that the percent kill of the aphids for each concentration given in the table below is high. Typical values are shown.

TABLE I Percent Kill Aphids- Concentration Compound o (Hrs 0 o=N-0 iNHoH3 100 100 100 cm-s CH;S

o=N-o iNHo,H5 100 100 as GET-S OHgS o o,=:NooN(oH3)z 100 100 100 GH2'S (m-s o I C=NO( 3Nl-I 100 100 100 GHQ-S (Hr-s o=N-0.( iNnon3 100 1 0 100 llHr-O om-s o=NodNnoH3- 100 100 100 0H3CHS oHi-s o H2O C=NO NHOHi 100 100 oar-s I GHQ-S C=NOCNHCH3 100 100 oH3-o11oZ Q-on-s 0 a II V i c=NooM1oHa.. 9o 0 oms CiH -OH-S c=N0dNHorn -1oo ion 95 oHr-s CHz-Ol1S 0 0=No( iNHoH3 100 100 100 CH3-CHS CH3 CHs' -CS o=NodNnoHa '100 100 100 C-Hz-S It is an advantage to utilize the insecticidal compositions of the present invention in dilute concentrations by incorporating the latter compounds in a variety of inert carriers or diluents. For instance, the compounds may be dissolved in an inert organic solvent such as acetone, ethyl acetate, ethyl alcohol, benzene, kerosene and equivalets thereof, or they may be admixed with an inert solid carrier as, for example, fullers earth, bentonite, and the like. If desired, a suspension of the active compounds may be prepared by employing a non-solvent. In that event, it is advantageous to add thereto any commercially available dispersing or surface-active agent of the anionic or nonionic types.

Although the compounds of the present invention have been illustrated as possessing activity against aphids, they can also be advantageously employed in dilute concentra= tions as excellent miticides.

The quantity of inert solid or liquid carrier or diluent with respect to insecticidal compounds is not critical; 7 It has, however, been found that from about 0.000170 to about 101%, by weight of the compound, based on the weight of the inert carrier is generally sufiicient. V

I claim: H a 1 1. A carbamate of the formula:

wherein R R R R R and R are each selected from the group consisting of hydrogen, lower alkyl and phenyl, Q represents an atom selected from the group consisting of oxygen and sulfur,rn is aninteger from0 to 1, andR and R are each a radical selected from the I group consisting of hydrogen and lower alkyl 2. The. carbamate of '2-oximino-1,3-dithiolane.

3. The N-methyl c'arbamate or '2-oximino-L3-dithio- 7 V wherein R R R R R and R are each selected from the group consisting of hydrogen,lower alkyl and phenyl, Q represents an atom selected from the group consisting er oxygen and sul fur'R and R are each a radical selected from the group consisting of hydrogen and lower alkyl, ;and n'is an integer from 0 to 1, which comprises the stepofz' bringing into reactive combination substantially equimolar' quantities of a first reactant of the r a 7 12 wherein R R R ,;R ,HR and R Q and n-have the same values as above, and a second reactant selected from the group consistingof lower alkyl is-ocyanate, carbamyl halide and N-lower alkyl carbamyl halide, and thereafter recovering said carbamate.

8. A process for the preparation of a carbamate of the wherein R R ,'R R R "and R are each selected from the group cOnSist ingof hydrogen, lower alkyl and phenyl,-Q represents an atom selected from the group consisting of oxygen and sulfur, R and R are each a radical selected from the group consisting of hydrogen and lower alkyl, and n is an integer from 0 to 1, which comprises the step of; bringing into reactive combination v substantially equimolar quantities of a first reactant of the formula:

wherein R R R R R5 and R3, Q and n have the same values as above, phosgene as a second reactant, further reacting the resultant reaction mixture with about two rnols of a third reactant selected from the group consisting of ammonia, a lower alkyl primary amine and a v'loweralkyl secondary amine, and thereafter recovering said carbamate,

References Cited by the Examiner UNITED STATES PATENTS 2,974,084 3/51 Mayhew et al. 167--33 3,008,966 11/61 'Hauptscheinet al. 260-327 3,081,311 3/63 Sullivan et al. 260-327 V WALTER A. MODANCE, Primary Examiner.

NICHOLAISVS. RIZZO, Elcaminer. 

1. A CARBAMATE OF THE FORMULA: 